Here is my honest opinion. No one can live a double life forever. I woke up quite a few years ago.....and lived a double life for years.....hoping I could reach my wife. Living a double life will suppress and depress you. I know it is hard. But you have a husband (hopefully your relationship there is good) and a child. THAT is your family!
When I left the organization finally, my wife left me and took the kids. We are now battling it out in court. Thankfully I have my sisters and my mom (who have all left the organization) for support. But you know what? If i could have......I would have traded my siblings and my mom in order to have my wife and my children all on board with me. Like I said......THAT is your family now and THAT is what is most important. Don't risk your REAL family for a cult.
You should not have to hide who you really are just to have contact with your family. I don't mean to sound harsh.....but are you really that desperate? If your family only loves you because of your social standing within a religious cult......then is that a love you really want to chase? If so why? Maybe I have a little too much self pride.....but I'll be damned if I am going to live the rest of my life pretending to be someone I am not just so I can earn someone else's CONDITIONAL love.
I also agree with earthfire. If you raise your child with even SOME JW beliefs.....depending on the mindset of the child.....he/she may be inclined to give his/her life to the group when older. Especially if you forge a closer bond with your family and they all help indoctrinate your child.